Is Felix Five-Boots legal in Standard, Modern, and Commander?

Felix Five-Boots is legal in: Legacy, Vintage, Commander.

Felix Five-Boots

Q: What type of card is Felix Five-Boots?

Felix Five-Boots is a Legendary Creature — Ooze Rogue. Its oracle text reads: "Menace, ward {2} If a creature you control dealing combat damage to a player causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time."

Legendary Creature — Ooze Rogue

Menace, ward

If a creature you control dealing combat damage to a player causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.

Set Outlaws of Thunder Junction Commander

Rarity Mythic Rare

Mana Value 5

Artist Chris Rahn

Collector # 6

Scryfall Gatherer